HMD Optical Alignment via Force-Suppressing Engagement Mechanism
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Solution Overview
Problem
Head-mounted displays (HMDs) for virtual and mixed reality suffer from reduced optical accuracy due to deformation caused by external forces, such as twisting, which affects the alignment of display units and compromises image quality.
Innovation Solution
An image display device with a display optical system guided by a base and main body exterior, featuring an engagement mechanism that suppresses external forces, ensuring the display optical system moves in conjunction with the exterior while maintaining alignment, using a combination of rail members and lens hoods to absorb and distribute forces, thereby maintaining optical accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display unit is attached to a main body frame via a rail, then the display unit can be adjusted and positioned, but the rail plastically deforms under external force, reducing optical accuracy
Solution Approach 1:
The device is divided into separate functional modules: a main body frame, a display unit, and an engagement mechanism with multiple components (engagement protrusion, engagement groove, suppression members). This segmentation allows each component to perform its specific function while reducing stress concentration on any single element, preventing plastic deformation of the positioning structure.
Solution Approach 2:
The engagement mechanism acts as an intermediary between the main body frame and the display unit. The suppression members specifically intervene to block the transmission of external forces (such as twisting forces) to the base and display unit, while still allowing the rail to function for positioning and adjustment. This mediator protects the optical accuracy-critical components from damaging forces.
2Device complexity
If the display optical system is directly mounted on the main body, then the structure is simplified, but external forces cause deformation and misalignment
Solution Approach 1:
The engagement mechanism incorporates movable suppression members that can dynamically respond to external forces. When external forces are applied, the suppression members engage to suppress force transmission, and can move or adjust their position accordingly. This dynamic response protects the alignment accuracy without requiring an overly rigid and complex static structure.
3Stability of the object's composition
If rigid connections are used between components, then structural stability is improved, but external forces are transmitted causing deformation
Solution Approach 1:
The engagement mechanism is designed to selectively transmit and block forces. The suppression members are positioned and dimensioned to block harmful external forces (such as twisting forces that cause deformation) while allowing necessary operational forces (such as adjustment forces) to be transmitted. This converts the potential harm of force transmission into a beneficial selective force management system.
Data Source
AI summary
An image display device includes a display optical system, a base including a display optical system guide unit configured to guide the display optical system in a substantially linear direction, a main body exterior configured to house the base, a display exterior configured to cover the display optical system, and a display exterior guide unit configured to guide the display exterior in a substantially linear direction relative to the main body exterior, wherein the display optical system is engaged with the display exterior to move in conjunction with the display exterior, and wherein the base and the main body exterior are engaged with each other by an engagement mechanism configured to suppress transmission of an external force applied to the main body exterior to the base.